If you ever get a chance to check out The Office webisodes on NBC.com (or Hulu), they are well worth the time. The webisodes are a great opportunity to focus on some of the hilarious characters that are often relegated to the background while the focus stays on the "core" group.
Kelly and Andy are probably my two favorite Office characters, and I have been really impressed with how well Erin has fit in to the show as well...and B.J. Novack's arrogant cluelessness is never more on display than it is here:
STRAIGHT OUT OF LACKAWANNAAAAAAAA!!!!